| Message ID | 1295864a38810a6db6c97e298c6663ae2b1350c1.1536736399.git.baolin.wang@linaro.org |
|---|---|
| State | New |
| Headers | show |
| Series | None | expand |
Hi, Looks mostly good. I have a couple of comments in addition to the ones from the binding about using battery_info for the OCV -> capacity mapping. On Wed, Sep 12, 2018 at 03:29:39PM +0800, Baolin Wang wrote: > This patch adds the Spreadtrum SC27XX serial PMICs fuel gauge support, > which is used to calculate the battery capacity. > > Original-by: Yuanjiang Yu <yuanjiang.yu@unisoc.com> > Signed-off-by: Baolin Wang <baolin.wang@linaro.org> > --- > drivers/power/supply/Kconfig | 7 + > drivers/power/supply/Makefile | 1 + > drivers/power/supply/sc27xx_fuel_gauge.c | 705 ++++++++++++++++++++++++++++++ > 3 files changed, 713 insertions(+) > create mode 100644 drivers/power/supply/sc27xx_fuel_gauge.c > > diff --git a/drivers/power/supply/Kconfig b/drivers/power/supply/Kconfig > index f27cf07..917f4b7 100644 > --- a/drivers/power/supply/Kconfig > +++ b/drivers/power/supply/Kconfig > @@ -652,4 +652,11 @@ config CHARGER_SC2731 > Say Y here to enable support for battery charging with SC2731 > PMIC chips. > > +config FUEL_GAUGE_SC27XX > + tristate "Spreadtrum SC27XX fuel gauge driver" > + depends on MFD_SC27XX_PMIC || COMPILE_TEST > + help > + Say Y here to enable support for fuel gauge with SC27XX > + PMIC chips. > + > endif # POWER_SUPPLY > diff --git a/drivers/power/supply/Makefile b/drivers/power/supply/Makefile > index 767105b..b731c2a 100644 > --- a/drivers/power/supply/Makefile > +++ b/drivers/power/supply/Makefile > @@ -86,3 +86,4 @@ obj-$(CONFIG_AXP288_FUEL_GAUGE) += axp288_fuel_gauge.o > obj-$(CONFIG_AXP288_CHARGER) += axp288_charger.o > obj-$(CONFIG_CHARGER_CROS_USBPD) += cros_usbpd-charger.o > obj-$(CONFIG_CHARGER_SC2731) += sc2731_charger.o > +obj-$(CONFIG_FUEL_GAUGE_SC27XX) += sc27xx_fuel_gauge.o > diff --git a/drivers/power/supply/sc27xx_fuel_gauge.c b/drivers/power/supply/sc27xx_fuel_gauge.c > new file mode 100644 > index 0000000..4df0f47 > --- /dev/null > +++ b/drivers/power/supply/sc27xx_fuel_gauge.c > @@ -0,0 +1,705 @@ > +// SPDX-License-Identifier: GPL-2.0 > +// Copyright (C) 2018 Spreadtrum Communications Inc. > + > +#include <linux/gpio/consumer.h> > +#include <linux/iio/consumer.h> > +#include <linux/interrupt.h> > +#include <linux/kernel.h> > +#include <linux/module.h> > +#include <linux/of.h> > +#include <linux/platform_device.h> > +#include <linux/power_supply.h> > +#include <linux/regmap.h> > + > +/* PMIC global control registers definition */ > +#define SC27XX_MODULE_EN0 0xc08 > +#define SC27XX_CLK_EN0 0xc18 > +#define SC27XX_FGU_EN BIT(7) > +#define SC27XX_FGU_RTC_EN BIT(6) > + > +/* FGU registers definition */ > +#define SC27XX_FGU_START 0x0 > +#define SC27XX_FGU_CONFIG 0x4 > +#define SC27XX_FGU_ADC_CONFIG 0x8 > +#define SC27XX_FGU_STATUS 0xc > +#define SC27XX_FGU_INT_EN 0x10 > +#define SC27XX_FGU_INT_CLR 0x14 > +#define SC27XX_FGU_INT_STS 0x1c > +#define SC27XX_FGU_VOLTAGE 0x20 > +#define SC27XX_FGU_OCV 0x24 > +#define SC27XX_FGU_POCV 0x28 > +#define SC27XX_FGU_CURRENT 0x2c > +#define SC27XX_FGU_CLBCNT_SETH 0x50 > +#define SC27XX_FGU_CLBCNT_SETL 0x54 > +#define SC27XX_FGU_CLBCNT_VALH 0x68 > +#define SC27XX_FGU_CLBCNT_VALL 0x6c > +#define SC27XX_FGU_CLBCNT_QMAXL 0x74 > + > +#define SC27XX_WRITE_SELCLB_EN BIT(0) > +#define SC27XX_FGU_CLBCNT_MASK GENMASK(15, 0) > +#define SC27XX_FGU_CLBCNT_SHIFT 16 > + > +#define SC27XX_FGU_1000MV_ADC 686 > +#define SC27XX_FGU_1000MA_ADC 1372 > +#define SC27XX_FGU_CUR_BASIC_ADC 8192 > +#define SC27XX_FGU_SAMPLE_HZ 2 > + > +struct sc27xx_fgu_capacity_table { > + int ocv; > + int capacity; > +}; > + > +/* > + * struct sc27xx_fgu_data: describe the FGU device > + * @regmap: regmap for register access > + * @dev: platform device > + * @battery: battery power supply > + * @base: the base offset for the controller > + * @lock: protect the structure > + * @gpiod: GPIO for battery detection > + * @channel: IIO channel to get battery temperature > + * @inner_resist: the battery inner resistance in mOhm > + * @total_cap: the total capacity of the battery in mAh > + * @init_cap: the initial capacity of the battery in mAh > + * @init_clbcnt: the initial coulomb counter > + * @max_volt: the maximum constant input voltage in millivolt > + * @table_len: the capacity table length > + * @cap_table: capacity table with corresponding ocv > + */ > +struct sc27xx_fgu_data { > + struct regmap *regmap; > + struct device *dev; > + struct power_supply *battery; > + u32 base; > + struct mutex lock; > + struct gpio_desc *gpiod; > + struct iio_channel *channel; > + bool bat_present; > + int inner_resist; > + int total_cap; > + int init_cap; > + int init_clbcnt; > + int max_volt; > + int table_len; > + struct sc27xx_fgu_capacity_table *cap_table; > +}; > + > +static const char * const sc27xx_charger_supply_name[] = { > + "sc2731_charger", > + "sc2720_charger", > + "sc2721_charger", > + "sc2723_charger", > +}; > + > +static int sc27xx_fgu_adc_to_current(int adc) > +{ > + return (adc * 1000) / SC27XX_FGU_1000MA_ADC; > +} > + > +static int sc27xx_fgu_adc_to_voltage(int adc) > +{ > + return (adc * 1000) / SC27XX_FGU_1000MV_ADC; > +} > + > +static int sc27xx_fgu_ocv_to_capacity(struct sc27xx_fgu_data *data, int ocv) > +{ > + struct sc27xx_fgu_capacity_table *tab = data->cap_table; > + int n = data->table_len; > + int i, cap, tmp; > + > + /* > + * Find the position in the table for current battery OCV value, > + * then use these two points to calculate battery capacity > + * according to the linear method. > + */ > + for (i = 0; i < n; i++) > + if (ocv > tab[i].ocv) > + break; > + > + if (i > 0 && i < n) { > + tmp = (tab[i - 1].capacity - tab[i].capacity) * > + (ocv - tab[i].ocv) * 2; > + tmp /= tab[i - 1].ocv - tab[i].ocv; > + tmp = (tmp + 1) / 2; > + cap = tmp + tab[i].capacity; > + } else if (i == 0) { > + cap = tab[0].capacity; > + } else { > + cap = tab[n - 1].capacity; > + } > + > + return cap; > +} > + > +/* > + * When system boots on, we can not read battery capacity from coulomb > + * registers, since now the coulomb registers are invalid. So we should > + * calculate the battery open circuit voltage, and get current battery > + * capacity according to the capacity table. > + */ > +static int sc27xx_fgu_get_boot_capacity(struct sc27xx_fgu_data *data, int *cap) > +{ > + int volt, cur, oci, ocv, ret; > + > + /* > + * After system booting on, the SC27XX_FGU_CLBCNT_QMAXL register saved > + * the first sampled open circuit current. > + */ > + ret = regmap_read(data->regmap, data->base + SC27XX_FGU_CLBCNT_QMAXL, > + &cur); > + if (ret) > + return ret; > + > + cur <<= 1; > + oci = sc27xx_fgu_adc_to_current(cur - SC27XX_FGU_CUR_BASIC_ADC); > + > + /* > + * Should get the OCV from SC27XX_FGU_POCV register at the system > + * beginning. It is ADC values reading from registers which need to > + * convert the corresponding voltage. > + */ > + ret = regmap_read(data->regmap, data->base + SC27XX_FGU_POCV, &volt); > + if (ret) > + return ret; > + > + volt = sc27xx_fgu_adc_to_voltage(volt); > + ocv = volt - (oci * data->inner_resist) / 1000; > + > + /* > + * Parse the capacity table to look up the correct capacity percent > + * according to current battery's corresponding OCV values. > + */ > + *cap = sc27xx_fgu_ocv_to_capacity(data, ocv); > + > + return 0; > +} > + > +static int sc27xx_fgu_set_clbcnt(struct sc27xx_fgu_data *data, int clbcnt) > +{ > + int ret; > + > + clbcnt *= SC27XX_FGU_SAMPLE_HZ; > + > + ret = regmap_update_bits(data->regmap, > + data->base + SC27XX_FGU_CLBCNT_SETL, > + SC27XX_FGU_CLBCNT_MASK, clbcnt); > + if (ret) > + return ret; > + > + ret = regmap_update_bits(data->regmap, > + data->base + SC27XX_FGU_CLBCNT_SETH, > + SC27XX_FGU_CLBCNT_MASK, > + clbcnt >> SC27XX_FGU_CLBCNT_SHIFT); > + if (ret) > + return ret; > + > + return regmap_update_bits(data->regmap, data->base + SC27XX_FGU_START, > + SC27XX_WRITE_SELCLB_EN, > + SC27XX_WRITE_SELCLB_EN); > +} > + > +static int sc27xx_fgu_get_clbcnt(struct sc27xx_fgu_data *data, int *clb_cnt) > +{ > + int ccl, cch, ret; > + > + ret = regmap_read(data->regmap, data->base + SC27XX_FGU_CLBCNT_VALL, > + &ccl); > + if (ret) > + return ret; > + > + ret = regmap_read(data->regmap, data->base + SC27XX_FGU_CLBCNT_VALH, > + &cch); > + if (ret) > + return ret; > + > + *clb_cnt = ccl & SC27XX_FGU_CLBCNT_MASK; > + *clb_cnt |= (cch & SC27XX_FGU_CLBCNT_MASK) << SC27XX_FGU_CLBCNT_SHIFT; > + *clb_cnt /= SC27XX_FGU_SAMPLE_HZ; > + > + return 0; > +} > + > +static int sc27xx_fgu_get_capacity(struct sc27xx_fgu_data *data, int *cap) > +{ > + int ret, cur_clbcnt, delta_clbcnt, delta_cap, temp; > + > + /* Get current coulomb counters firstly */ > + ret = sc27xx_fgu_get_clbcnt(data, &cur_clbcnt); > + if (ret) > + return ret; > + > + delta_clbcnt = cur_clbcnt - data->init_clbcnt; > + > + /* > + * Convert coulomb counter to delta capacity (mAh), and set multiplier > + * as 100 to improve the precision. > + */ > + temp = DIV_ROUND_CLOSEST(delta_clbcnt, 360); > + temp = sc27xx_fgu_adc_to_current(temp); > + > + /* > + * Convert to capacity percent of the battery total capacity, > + * and multiplier is 100 too. > + */ > + delta_cap = DIV_ROUND_CLOSEST(temp * 100, data->total_cap); > + *cap = delta_cap + data->init_cap; > + > + return 0; > +} > + > +static int sc27xx_fgu_get_vbat_vol(struct sc27xx_fgu_data *data, int *val) > +{ > + int ret, vol; > + > + ret = regmap_read(data->regmap, data->base + SC27XX_FGU_VOLTAGE, &vol); > + if (ret) > + return ret; > + > + /* > + * It is ADC values reading from registers which need to convert to > + * corresponding voltage values. > + */ > + *val = sc27xx_fgu_adc_to_voltage(vol); > + > + return 0; > +} > + > +static int sc27xx_fgu_get_current(struct sc27xx_fgu_data *data, int *val) > +{ > + int ret, cur; > + > + ret = regmap_read(data->regmap, data->base + SC27XX_FGU_CURRENT, &cur); > + if (ret) > + return ret; > + > + /* > + * It is ADC values reading from registers which need to convert to > + * corresponding current values. > + */ > + *val = sc27xx_fgu_adc_to_current(cur - SC27XX_FGU_CUR_BASIC_ADC); > + > + return 0; > +} > + > +static int sc27xx_fgu_get_vbat_ocv(struct sc27xx_fgu_data *data, int *val) > +{ > + int vol, cur, ret; > + > + ret = sc27xx_fgu_get_vbat_vol(data, &vol); > + if (ret) > + return ret; > + > + ret = sc27xx_fgu_get_current(data, &cur); > + if (ret) > + return ret; > + > + *val = vol - (cur * data->inner_resist) / 1000; You multiply this with 1000 directly after this function to get back to uV. Just drop the division and the multiplication. > + > + return 0; > +} > + > +static int sc27xx_fgu_get_temp(struct sc27xx_fgu_data *data, int *temp) > +{ > + return iio_read_channel_processed(data->channel, temp); > +} > + > +static int sc27xx_fgu_get_health(struct sc27xx_fgu_data *data, int *health) > +{ > + int ret, vol; > + > + ret = sc27xx_fgu_get_vbat_vol(data, &vol); > + if (ret) > + return ret; > + > + if (vol > data->max_volt) > + *health = POWER_SUPPLY_HEALTH_OVERVOLTAGE; > + else > + *health = POWER_SUPPLY_HEALTH_GOOD; > + > + return 0; > +} > + > +static int sc27xx_fgu_get_status(struct sc27xx_fgu_data *data, int *status) > +{ > + union power_supply_propval val; > + struct power_supply *psy; > + int i, ret = -EINVAL; > + > + for (i = 0; i < ARRAY_SIZE(sc27xx_charger_supply_name); i++) { > + psy = power_supply_get_by_name(sc27xx_charger_supply_name[i]); > + if (!psy) > + continue; > + > + ret = power_supply_get_property(psy, POWER_SUPPLY_PROP_STATUS, > + &val); > + power_supply_put(psy); > + if (ret) > + return ret; > + > + *status = val.intval; > + } > + > + return ret; > +} > + > +static int sc27xx_fgu_get_property(struct power_supply *psy, > + enum power_supply_property psp, > + union power_supply_propval *val) > +{ > + struct sc27xx_fgu_data *data = power_supply_get_drvdata(psy); > + int ret = 0; > + int value; > + > + mutex_lock(&data->lock); > + > + switch (psp) { > + case POWER_SUPPLY_PROP_STATUS: > + ret = sc27xx_fgu_get_status(data, &value); > + if (ret) > + goto error; > + > + val->intval = value; > + break; > + > + case POWER_SUPPLY_PROP_HEALTH: > + ret = sc27xx_fgu_get_health(data, &value); > + if (ret) > + goto error; > + > + val->intval = value; > + break; > + > + case POWER_SUPPLY_PROP_PRESENT: > + val->intval = data->bat_present; > + break; > + > + case POWER_SUPPLY_PROP_TEMP: > + ret = sc27xx_fgu_get_temp(data, &value); > + if (ret) > + goto error; > + > + val->intval = value; > + break; > + > + case POWER_SUPPLY_PROP_TECHNOLOGY: > + val->intval = POWER_SUPPLY_TECHNOLOGY_LION; > + break; > + > + case POWER_SUPPLY_PROP_CAPACITY: > + ret = sc27xx_fgu_get_capacity(data, &value); > + if (ret) > + goto error; > + > + val->intval = value; > + break; > + > + case POWER_SUPPLY_PROP_VOLTAGE_NOW: > + ret = sc27xx_fgu_get_vbat_vol(data, &value); > + if (ret) > + goto error; > + > + val->intval = value * 1000; > + break; > + > + case POWER_SUPPLY_PROP_VOLTAGE_OCV: > + ret = sc27xx_fgu_get_vbat_ocv(data, &value); > + if (ret) > + goto error; > + > + val->intval = value * 1000; > + break; > + > + case POWER_SUPPLY_PROP_CURRENT_NOW: > + case POWER_SUPPLY_PROP_CURRENT_AVG: > + ret = sc27xx_fgu_get_current(data, &value); > + if (ret) > + goto error; > + > + val->intval = value * 1000; > + break; > + > + default: > + ret = -EINVAL; > + break; > + } > + > +error: > + mutex_unlock(&data->lock); > + return ret; > +} > + > +static void sc27xx_fgu_external_power_changed(struct power_supply *psy) > +{ > + struct sc27xx_fgu_data *data = power_supply_get_drvdata(psy); > + > + power_supply_changed(data->battery); > +} > + > +static enum power_supply_property sc27xx_fgu_props[] = { > + POWER_SUPPLY_PROP_STATUS, > + POWER_SUPPLY_PROP_HEALTH, > + POWER_SUPPLY_PROP_PRESENT, > + POWER_SUPPLY_PROP_TEMP, > + POWER_SUPPLY_PROP_TECHNOLOGY, > + POWER_SUPPLY_PROP_CAPACITY, > + POWER_SUPPLY_PROP_VOLTAGE_NOW, > + POWER_SUPPLY_PROP_VOLTAGE_OCV, > + POWER_SUPPLY_PROP_CURRENT_NOW, > + POWER_SUPPLY_PROP_CURRENT_AVG, > +}; > + > +static const struct power_supply_desc sc27xx_fgu_desc = { > + .name = "sc27xx-fgu", > + .type = POWER_SUPPLY_TYPE_BATTERY, > + .properties = sc27xx_fgu_props, > + .num_properties = ARRAY_SIZE(sc27xx_fgu_props), > + .get_property = sc27xx_fgu_get_property, > + .external_power_changed = sc27xx_fgu_external_power_changed, > +}; > + > +static irqreturn_t sc27xx_fgu_bat_detection(int irq, void *dev_id) > +{ > + struct sc27xx_fgu_data *data = dev_id; > + int state; > + > + mutex_lock(&data->lock); > + > + state = gpiod_get_value_cansleep(data->gpiod); > + if (state < 0) { > + dev_err(data->dev, "failed to get gpio state\n"); > + mutex_unlock(&data->lock); > + return IRQ_RETVAL(state); > + } > + > + if (state) > + data->bat_present = true; > + else > + data->bat_present = false; > + > + mutex_unlock(&data->lock); You want to call power_supply_changed() here. > + return IRQ_HANDLED; > +} > + > +static void sc27xx_fgu_disable(void *_data) > +{ > + struct sc27xx_fgu_data *data = _data; > + > + regmap_update_bits(data->regmap, SC27XX_CLK_EN0, SC27XX_FGU_RTC_EN, 0); > + regmap_update_bits(data->regmap, SC27XX_MODULE_EN0, SC27XX_FGU_EN, 0); > +} > + > +static int sc27xx_fgu_cap_to_clbcnt(struct sc27xx_fgu_data *data, int capacity) > +{ > + /* > + * Get current capacity (mAh) = battery total capacity (mAh) * > + * current capacity percent (capacity / 100). > + */ > + int cur_cap = DIV_ROUND_CLOSEST(data->total_cap * capacity, 100); > + > + /* > + * Convert current capacity (mAh) to coulomb counter according to the > + * formula: 1 mAh =3.6 coulomb. > + */ > + return DIV_ROUND_CLOSEST(cur_cap * 36, 10); > +} > + > +static int sc27xx_fgu_hw_init(struct sc27xx_fgu_data *data) > +{ > + struct power_supply_battery_info info = { }; > + int ret; > + > + ret = power_supply_get_battery_info(data->battery, &info); > + if (ret) { > + dev_err(data->dev, "failed to get battery information\n"); > + return ret; > + } > + > + data->total_cap = info.charge_full_design_uah / 1000; > + data->max_volt = info.constant_charge_voltage_max_uv / 1000; > + > + /* Enable the FGU module */ > + ret = regmap_update_bits(data->regmap, SC27XX_MODULE_EN0, > + SC27XX_FGU_EN, SC27XX_FGU_EN); > + if (ret) { > + dev_err(data->dev, "failed to enable fgu\n"); > + return ret; > + } > + > + /* Enable the FGU RTC clock to make it work */ > + ret = regmap_update_bits(data->regmap, SC27XX_CLK_EN0, > + SC27XX_FGU_RTC_EN, SC27XX_FGU_RTC_EN); > + if (ret) { > + dev_err(data->dev, "failed to enable fgu RTC clock\n"); > + goto disable_fgu; > + } > + > + /* > + * Get the boot battery capacity when system powers on, which is used to > + * initialize the coulomb counter. After that, we can read the coulomb > + * counter to measure the battery capacity. > + */ > + ret = sc27xx_fgu_get_boot_capacity(data, &data->init_cap); > + if (ret) { > + dev_err(data->dev, "failed to get boot capacity\n"); > + goto disable_clk; > + } > + > + /* > + * Convert battery capacity to the corresponding initial coulomb counter > + * and set into coulomb counter registers. > + */ > + data->init_clbcnt = sc27xx_fgu_cap_to_clbcnt(data, data->init_cap); > + ret = sc27xx_fgu_set_clbcnt(data, data->init_clbcnt); > + if (ret) { > + dev_err(data->dev, "failed to initialize coulomb counter\n"); > + goto disable_clk; > + } > + > + return 0; > + > +disable_clk: > + regmap_update_bits(data->regmap, SC27XX_CLK_EN0, SC27XX_FGU_RTC_EN, 0); > +disable_fgu: > + regmap_update_bits(data->regmap, SC27XX_MODULE_EN0, SC27XX_FGU_EN, 0); > + > + return ret; > +} > + > +static int sc27xx_fgu_parse_dt(struct sc27xx_fgu_data *data, > + struct device_node *np) > +{ > + const __be32 *list; > + int i, len, size, ret; > + > + ret = of_property_read_u32(np, "reg", &data->base); > + if (ret) { > + dev_err(data->dev, "failed to get fgu address\n"); > + return ret; > + } > + > + data->gpiod = devm_gpiod_get_optional(data->dev, "bat-detect", GPIOD_IN); > + if (IS_ERR(data->gpiod)) { > + dev_err(data->dev, "failed to get battery detection GPIO\n"); > + return PTR_ERR(data->gpiod); > + } According to the binding (and the remaining code!) this gpio is not optional. -- Sebastian > + data->channel = devm_iio_channel_get(data->dev, "bat-temp"); > + if (IS_ERR(data->channel)) { > + dev_err(data->dev, "failed to get IIO channel\n"); > + return PTR_ERR(data->channel); > + } > + > + /* Get the battery inner resistance */ > + ret = of_property_read_u32(np, "sprd,inner-resist", &data->inner_resist); > + if (ret) { > + dev_err(data->dev, "failed to get battery inner resistance\n"); > + return ret; > + } > + > + /* Get battery ocv-capacity table */ > + list = of_get_property(np, "sprd,ocv-cap-table", &size); > + if (!list || !size) { > + dev_err(data->dev, "failed to get ocv-capacity table\n"); > + return -EINVAL; > + } > + > + len = size / 8; > + data->table_len = len; > + data->cap_table = devm_kzalloc(data->dev, > + sizeof(struct sc27xx_fgu_capacity_table) * len, > + GFP_KERNEL); > + if (!data->cap_table) > + return -ENOMEM; > + > + for (i = 0; i < len; i++) { > + data->cap_table[i].ocv = be32_to_cpu(*list++); > + data->cap_table[i].capacity = be32_to_cpu(*list++); > + } > + > + return 0; > +} > + > +static int sc27xx_fgu_probe(struct platform_device *pdev) > +{ > + struct device_node *np = pdev->dev.of_node; > + struct power_supply_config fgu_cfg = { }; > + struct sc27xx_fgu_data *data; > + int ret, irq; > + > + data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL); > + if (!data) > + return -ENOMEM; > + > + data->regmap = dev_get_regmap(pdev->dev.parent, NULL); > + if (!data->regmap) { > + dev_err(&pdev->dev, "failed to get regmap\n"); > + return -ENODEV; > + } > + > + mutex_init(&data->lock); > + data->dev = &pdev->dev; > + data->bat_present = true; > + > + ret = sc27xx_fgu_parse_dt(data, np); > + if (ret) > + return ret; > + > + fgu_cfg.drv_data = data; > + fgu_cfg.of_node = np; > + data->battery = devm_power_supply_register(&pdev->dev, &sc27xx_fgu_desc, > + &fgu_cfg); > + if (IS_ERR(data->battery)) { > + dev_err(&pdev->dev, "failed to register power supply\n"); > + return PTR_ERR(data->battery); > + } > + > + ret = sc27xx_fgu_hw_init(data); > + if (ret) { > + dev_err(&pdev->dev, "failed to initialize fgu hardware\n"); > + return ret; > + } > + > + ret = devm_add_action(&pdev->dev, sc27xx_fgu_disable, data); > + if (ret) { > + sc27xx_fgu_disable(data); > + dev_err(&pdev->dev, "failed to add fgu disable action\n"); > + return ret; > + } > + > + irq = gpiod_to_irq(data->gpiod); > + if (irq < 0) { > + dev_err(&pdev->dev, "failed to translate GPIO to IRQ\n"); > + return irq; > + } > + > + ret = devm_request_threaded_irq(&pdev->dev, irq, NULL, > + sc27xx_fgu_bat_detection, > + IRQF_ONESHOT | IRQF_TRIGGER_RISING | > + IRQF_TRIGGER_FALLING, > + pdev->name, data); > + if (ret) { > + dev_err(&pdev->dev, "failed to request IRQ\n"); > + return ret; > + } > + > + return 0; > +} > + > +static const struct of_device_id sc27xx_fgu_of_match[] = { > + { .compatible = "sprd,sc2731-fgu", }, > + { } > +}; > + > +static struct platform_driver sc27xx_fgu_driver = { > + .probe = sc27xx_fgu_probe, > + .driver = { > + .name = "sc27xx-fgu", > + .of_match_table = sc27xx_fgu_of_match, > + } > +}; > + > +module_platform_driver(sc27xx_fgu_driver); > + > +MODULE_DESCRIPTION("Spreadtrum SC27XX PMICs Fual Gauge Unit Driver"); > +MODULE_LICENSE("GPL v2"); > -- > 1.7.9.5 >
diff --git a/drivers/power/supply/Kconfig b/drivers/power/supply/Kconfig index f27cf07..917f4b7 100644 --- a/drivers/power/supply/Kconfig +++ b/drivers/power/supply/Kconfig @@ -652,4 +652,11 @@ config CHARGER_SC2731 Say Y here to enable support for battery charging with SC2731 PMIC chips. +config FUEL_GAUGE_SC27XX + tristate "Spreadtrum SC27XX fuel gauge driver" + depends on MFD_SC27XX_PMIC || COMPILE_TEST + help + Say Y here to enable support for fuel gauge with SC27XX + PMIC chips. + endif # POWER_SUPPLY diff --git a/drivers/power/supply/Makefile b/drivers/power/supply/Makefile index 767105b..b731c2a 100644 --- a/drivers/power/supply/Makefile +++ b/drivers/power/supply/Makefile @@ -86,3 +86,4 @@ obj-$(CONFIG_AXP288_FUEL_GAUGE) += axp288_fuel_gauge.o obj-$(CONFIG_AXP288_CHARGER) += axp288_charger.o obj-$(CONFIG_CHARGER_CROS_USBPD) += cros_usbpd-charger.o obj-$(CONFIG_CHARGER_SC2731) += sc2731_charger.o +obj-$(CONFIG_FUEL_GAUGE_SC27XX) += sc27xx_fuel_gauge.o diff --git a/drivers/power/supply/sc27xx_fuel_gauge.c b/drivers/power/supply/sc27xx_fuel_gauge.c new file mode 100644 index 0000000..4df0f47 --- /dev/null +++ b/drivers/power/supply/sc27xx_fuel_gauge.c @@ -0,0 +1,705 @@ +// SPDX-License-Identifier: GPL-2.0 +// Copyright (C) 2018 Spreadtrum Communications Inc. + +#include <linux/gpio/consumer.h> +#include <linux/iio/consumer.h> +#include <linux/interrupt.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/platform_device.h> +#include <linux/power_supply.h> +#include <linux/regmap.h> + +/* PMIC global control registers definition */ +#define SC27XX_MODULE_EN0 0xc08 +#define SC27XX_CLK_EN0 0xc18 +#define SC27XX_FGU_EN BIT(7) +#define SC27XX_FGU_RTC_EN BIT(6) + +/* FGU registers definition */ +#define SC27XX_FGU_START 0x0 +#define SC27XX_FGU_CONFIG 0x4 +#define SC27XX_FGU_ADC_CONFIG 0x8 +#define SC27XX_FGU_STATUS 0xc +#define SC27XX_FGU_INT_EN 0x10 +#define SC27XX_FGU_INT_CLR 0x14 +#define SC27XX_FGU_INT_STS 0x1c +#define SC27XX_FGU_VOLTAGE 0x20 +#define SC27XX_FGU_OCV 0x24 +#define SC27XX_FGU_POCV 0x28 +#define SC27XX_FGU_CURRENT 0x2c +#define SC27XX_FGU_CLBCNT_SETH 0x50 +#define SC27XX_FGU_CLBCNT_SETL 0x54 +#define SC27XX_FGU_CLBCNT_VALH 0x68 +#define SC27XX_FGU_CLBCNT_VALL 0x6c +#define SC27XX_FGU_CLBCNT_QMAXL 0x74 + +#define SC27XX_WRITE_SELCLB_EN BIT(0) +#define SC27XX_FGU_CLBCNT_MASK GENMASK(15, 0) +#define SC27XX_FGU_CLBCNT_SHIFT 16 + +#define SC27XX_FGU_1000MV_ADC 686 +#define SC27XX_FGU_1000MA_ADC 1372 +#define SC27XX_FGU_CUR_BASIC_ADC 8192 +#define SC27XX_FGU_SAMPLE_HZ 2 + +struct sc27xx_fgu_capacity_table { + int ocv; + int capacity; +}; + +/* + * struct sc27xx_fgu_data: describe the FGU device + * @regmap: regmap for register access + * @dev: platform device + * @battery: battery power supply + * @base: the base offset for the controller + * @lock: protect the structure + * @gpiod: GPIO for battery detection + * @channel: IIO channel to get battery temperature + * @inner_resist: the battery inner resistance in mOhm + * @total_cap: the total capacity of the battery in mAh + * @init_cap: the initial capacity of the battery in mAh + * @init_clbcnt: the initial coulomb counter + * @max_volt: the maximum constant input voltage in millivolt + * @table_len: the capacity table length + * @cap_table: capacity table with corresponding ocv + */ +struct sc27xx_fgu_data { + struct regmap *regmap; + struct device *dev; + struct power_supply *battery; + u32 base; + struct mutex lock; + struct gpio_desc *gpiod; + struct iio_channel *channel; + bool bat_present; + int inner_resist; + int total_cap; + int init_cap; + int init_clbcnt; + int max_volt; + int table_len; + struct sc27xx_fgu_capacity_table *cap_table; +}; + +static const char * const sc27xx_charger_supply_name[] = { + "sc2731_charger", + "sc2720_charger", + "sc2721_charger", + "sc2723_charger", +}; + +static int sc27xx_fgu_adc_to_current(int adc) +{ + return (adc * 1000) / SC27XX_FGU_1000MA_ADC; +} + +static int sc27xx_fgu_adc_to_voltage(int adc) +{ + return (adc * 1000) / SC27XX_FGU_1000MV_ADC; +} + +static int sc27xx_fgu_ocv_to_capacity(struct sc27xx_fgu_data *data, int ocv) +{ + struct sc27xx_fgu_capacity_table *tab = data->cap_table; + int n = data->table_len; + int i, cap, tmp; + + /* + * Find the position in the table for current battery OCV value, + * then use these two points to calculate battery capacity + * according to the linear method. + */ + for (i = 0; i < n; i++) + if (ocv > tab[i].ocv) + break; + + if (i > 0 && i < n) { + tmp = (tab[i - 1].capacity - tab[i].capacity) * + (ocv - tab[i].ocv) * 2; + tmp /= tab[i - 1].ocv - tab[i].ocv; + tmp = (tmp + 1) / 2; + cap = tmp + tab[i].capacity; + } else if (i == 0) { + cap = tab[0].capacity; + } else { + cap = tab[n - 1].capacity; + } + + return cap; +} + +/* + * When system boots on, we can not read battery capacity from coulomb + * registers, since now the coulomb registers are invalid. So we should + * calculate the battery open circuit voltage, and get current battery + * capacity according to the capacity table. + */ +static int sc27xx_fgu_get_boot_capacity(struct sc27xx_fgu_data *data, int *cap) +{ + int volt, cur, oci, ocv, ret; + + /* + * After system booting on, the SC27XX_FGU_CLBCNT_QMAXL register saved + * the first sampled open circuit current. + */ + ret = regmap_read(data->regmap, data->base + SC27XX_FGU_CLBCNT_QMAXL, + &cur); + if (ret) + return ret; + + cur <<= 1; + oci = sc27xx_fgu_adc_to_current(cur - SC27XX_FGU_CUR_BASIC_ADC); + + /* + * Should get the OCV from SC27XX_FGU_POCV register at the system + * beginning. It is ADC values reading from registers which need to + * convert the corresponding voltage. + */ + ret = regmap_read(data->regmap, data->base + SC27XX_FGU_POCV, &volt); + if (ret) + return ret; + + volt = sc27xx_fgu_adc_to_voltage(volt); + ocv = volt - (oci * data->inner_resist) / 1000; + + /* + * Parse the capacity table to look up the correct capacity percent + * according to current battery's corresponding OCV values. + */ + *cap = sc27xx_fgu_ocv_to_capacity(data, ocv); + + return 0; +} + +static int sc27xx_fgu_set_clbcnt(struct sc27xx_fgu_data *data, int clbcnt) +{ + int ret; + + clbcnt *= SC27XX_FGU_SAMPLE_HZ; + + ret = regmap_update_bits(data->regmap, + data->base + SC27XX_FGU_CLBCNT_SETL, + SC27XX_FGU_CLBCNT_MASK, clbcnt); + if (ret) + return ret; + + ret = regmap_update_bits(data->regmap, + data->base + SC27XX_FGU_CLBCNT_SETH, + SC27XX_FGU_CLBCNT_MASK, + clbcnt >> SC27XX_FGU_CLBCNT_SHIFT); + if (ret) + return ret; + + return regmap_update_bits(data->regmap, data->base + SC27XX_FGU_START, + SC27XX_WRITE_SELCLB_EN, + SC27XX_WRITE_SELCLB_EN); +} + +static int sc27xx_fgu_get_clbcnt(struct sc27xx_fgu_data *data, int *clb_cnt) +{ + int ccl, cch, ret; + + ret = regmap_read(data->regmap, data->base + SC27XX_FGU_CLBCNT_VALL, + &ccl); + if (ret) + return ret; + + ret = regmap_read(data->regmap, data->base + SC27XX_FGU_CLBCNT_VALH, + &cch); + if (ret) + return ret; + + *clb_cnt = ccl & SC27XX_FGU_CLBCNT_MASK; + *clb_cnt |= (cch & SC27XX_FGU_CLBCNT_MASK) << SC27XX_FGU_CLBCNT_SHIFT; + *clb_cnt /= SC27XX_FGU_SAMPLE_HZ; + + return 0; +} + +static int sc27xx_fgu_get_capacity(struct sc27xx_fgu_data *data, int *cap) +{ + int ret, cur_clbcnt, delta_clbcnt, delta_cap, temp; + + /* Get current coulomb counters firstly */ + ret = sc27xx_fgu_get_clbcnt(data, &cur_clbcnt); + if (ret) + return ret; + + delta_clbcnt = cur_clbcnt - data->init_clbcnt; + + /* + * Convert coulomb counter to delta capacity (mAh), and set multiplier + * as 100 to improve the precision. + */ + temp = DIV_ROUND_CLOSEST(delta_clbcnt, 360); + temp = sc27xx_fgu_adc_to_current(temp); + + /* + * Convert to capacity percent of the battery total capacity, + * and multiplier is 100 too. + */ + delta_cap = DIV_ROUND_CLOSEST(temp * 100, data->total_cap); + *cap = delta_cap + data->init_cap; + + return 0; +} + +static int sc27xx_fgu_get_vbat_vol(struct sc27xx_fgu_data *data, int *val) +{ + int ret, vol; + + ret = regmap_read(data->regmap, data->base + SC27XX_FGU_VOLTAGE, &vol); + if (ret) + return ret; + + /* + * It is ADC values reading from registers which need to convert to + * corresponding voltage values. + */ + *val = sc27xx_fgu_adc_to_voltage(vol); + + return 0; +} + +static int sc27xx_fgu_get_current(struct sc27xx_fgu_data *data, int *val) +{ + int ret, cur; + + ret = regmap_read(data->regmap, data->base + SC27XX_FGU_CURRENT, &cur); + if (ret) + return ret; + + /* + * It is ADC values reading from registers which need to convert to + * corresponding current values. + */ + *val = sc27xx_fgu_adc_to_current(cur - SC27XX_FGU_CUR_BASIC_ADC); + + return 0; +} + +static int sc27xx_fgu_get_vbat_ocv(struct sc27xx_fgu_data *data, int *val) +{ + int vol, cur, ret; + + ret = sc27xx_fgu_get_vbat_vol(data, &vol); + if (ret) + return ret; + + ret = sc27xx_fgu_get_current(data, &cur); + if (ret) + return ret; + + *val = vol - (cur * data->inner_resist) / 1000; + + return 0; +} + +static int sc27xx_fgu_get_temp(struct sc27xx_fgu_data *data, int *temp) +{ + return iio_read_channel_processed(data->channel, temp); +} + +static int sc27xx_fgu_get_health(struct sc27xx_fgu_data *data, int *health) +{ + int ret, vol; + + ret = sc27xx_fgu_get_vbat_vol(data, &vol); + if (ret) + return ret; + + if (vol > data->max_volt) + *health = POWER_SUPPLY_HEALTH_OVERVOLTAGE; + else + *health = POWER_SUPPLY_HEALTH_GOOD; + + return 0; +} + +static int sc27xx_fgu_get_status(struct sc27xx_fgu_data *data, int *status) +{ + union power_supply_propval val; + struct power_supply *psy; + int i, ret = -EINVAL; + + for (i = 0; i < ARRAY_SIZE(sc27xx_charger_supply_name); i++) { + psy = power_supply_get_by_name(sc27xx_charger_supply_name[i]); + if (!psy) + continue; + + ret = power_supply_get_property(psy, POWER_SUPPLY_PROP_STATUS, + &val); + power_supply_put(psy); + if (ret) + return ret; + + *status = val.intval; + } + + return ret; +} + +static int sc27xx_fgu_get_property(struct power_supply *psy, + enum power_supply_property psp, + union power_supply_propval *val) +{ + struct sc27xx_fgu_data *data = power_supply_get_drvdata(psy); + int ret = 0; + int value; + + mutex_lock(&data->lock); + + switch (psp) { + case POWER_SUPPLY_PROP_STATUS: + ret = sc27xx_fgu_get_status(data, &value); + if (ret) + goto error; + + val->intval = value; + break; + + case POWER_SUPPLY_PROP_HEALTH: + ret = sc27xx_fgu_get_health(data, &value); + if (ret) + goto error; + + val->intval = value; + break; + + case POWER_SUPPLY_PROP_PRESENT: + val->intval = data->bat_present; + break; + + case POWER_SUPPLY_PROP_TEMP: + ret = sc27xx_fgu_get_temp(data, &value); + if (ret) + goto error; + + val->intval = value; + break; + + case POWER_SUPPLY_PROP_TECHNOLOGY: + val->intval = POWER_SUPPLY_TECHNOLOGY_LION; + break; + + case POWER_SUPPLY_PROP_CAPACITY: + ret = sc27xx_fgu_get_capacity(data, &value); + if (ret) + goto error; + + val->intval = value; + break; + + case POWER_SUPPLY_PROP_VOLTAGE_NOW: + ret = sc27xx_fgu_get_vbat_vol(data, &value); + if (ret) + goto error; + + val->intval = value * 1000; + break; + + case POWER_SUPPLY_PROP_VOLTAGE_OCV: + ret = sc27xx_fgu_get_vbat_ocv(data, &value); + if (ret) + goto error; + + val->intval = value * 1000; + break; + + case POWER_SUPPLY_PROP_CURRENT_NOW: + case POWER_SUPPLY_PROP_CURRENT_AVG: + ret = sc27xx_fgu_get_current(data, &value); + if (ret) + goto error; + + val->intval = value * 1000; + break; + + default: + ret = -EINVAL; + break; + } + +error: + mutex_unlock(&data->lock); + return ret; +} + +static void sc27xx_fgu_external_power_changed(struct power_supply *psy) +{ + struct sc27xx_fgu_data *data = power_supply_get_drvdata(psy); + + power_supply_changed(data->battery); +} + +static enum power_supply_property sc27xx_fgu_props[] = { + POWER_SUPPLY_PROP_STATUS, + POWER_SUPPLY_PROP_HEALTH, + POWER_SUPPLY_PROP_PRESENT, + POWER_SUPPLY_PROP_TEMP, + POWER_SUPPLY_PROP_TECHNOLOGY, + POWER_SUPPLY_PROP_CAPACITY, + POWER_SUPPLY_PROP_VOLTAGE_NOW, + POWER_SUPPLY_PROP_VOLTAGE_OCV, + POWER_SUPPLY_PROP_CURRENT_NOW, + POWER_SUPPLY_PROP_CURRENT_AVG, +}; + +static const struct power_supply_desc sc27xx_fgu_desc = { + .name = "sc27xx-fgu", + .type = POWER_SUPPLY_TYPE_BATTERY, + .properties = sc27xx_fgu_props, + .num_properties = ARRAY_SIZE(sc27xx_fgu_props), + .get_property = sc27xx_fgu_get_property, + .external_power_changed = sc27xx_fgu_external_power_changed, +}; + +static irqreturn_t sc27xx_fgu_bat_detection(int irq, void *dev_id) +{ + struct sc27xx_fgu_data *data = dev_id; + int state; + + mutex_lock(&data->lock); + + state = gpiod_get_value_cansleep(data->gpiod); + if (state < 0) { + dev_err(data->dev, "failed to get gpio state\n"); + mutex_unlock(&data->lock); + return IRQ_RETVAL(state); + } + + if (state) + data->bat_present = true; + else + data->bat_present = false; + + mutex_unlock(&data->lock); + + return IRQ_HANDLED; +} + +static void sc27xx_fgu_disable(void *_data) +{ + struct sc27xx_fgu_data *data = _data; + + regmap_update_bits(data->regmap, SC27XX_CLK_EN0, SC27XX_FGU_RTC_EN, 0); + regmap_update_bits(data->regmap, SC27XX_MODULE_EN0, SC27XX_FGU_EN, 0); +} + +static int sc27xx_fgu_cap_to_clbcnt(struct sc27xx_fgu_data *data, int capacity) +{ + /* + * Get current capacity (mAh) = battery total capacity (mAh) * + * current capacity percent (capacity / 100). + */ + int cur_cap = DIV_ROUND_CLOSEST(data->total_cap * capacity, 100); + + /* + * Convert current capacity (mAh) to coulomb counter according to the + * formula: 1 mAh =3.6 coulomb. + */ + return DIV_ROUND_CLOSEST(cur_cap * 36, 10); +} + +static int sc27xx_fgu_hw_init(struct sc27xx_fgu_data *data) +{ + struct power_supply_battery_info info = { }; + int ret; + + ret = power_supply_get_battery_info(data->battery, &info); + if (ret) { + dev_err(data->dev, "failed to get battery information\n"); + return ret; + } + + data->total_cap = info.charge_full_design_uah / 1000; + data->max_volt = info.constant_charge_voltage_max_uv / 1000; + + /* Enable the FGU module */ + ret = regmap_update_bits(data->regmap, SC27XX_MODULE_EN0, + SC27XX_FGU_EN, SC27XX_FGU_EN); + if (ret) { + dev_err(data->dev, "failed to enable fgu\n"); + return ret; + } + + /* Enable the FGU RTC clock to make it work */ + ret = regmap_update_bits(data->regmap, SC27XX_CLK_EN0, + SC27XX_FGU_RTC_EN, SC27XX_FGU_RTC_EN); + if (ret) { + dev_err(data->dev, "failed to enable fgu RTC clock\n"); + goto disable_fgu; + } + + /* + * Get the boot battery capacity when system powers on, which is used to + * initialize the coulomb counter. After that, we can read the coulomb + * counter to measure the battery capacity. + */ + ret = sc27xx_fgu_get_boot_capacity(data, &data->init_cap); + if (ret) { + dev_err(data->dev, "failed to get boot capacity\n"); + goto disable_clk; + } + + /* + * Convert battery capacity to the corresponding initial coulomb counter + * and set into coulomb counter registers. + */ + data->init_clbcnt = sc27xx_fgu_cap_to_clbcnt(data, data->init_cap); + ret = sc27xx_fgu_set_clbcnt(data, data->init_clbcnt); + if (ret) { + dev_err(data->dev, "failed to initialize coulomb counter\n"); + goto disable_clk; + } + + return 0; + +disable_clk: + regmap_update_bits(data->regmap, SC27XX_CLK_EN0, SC27XX_FGU_RTC_EN, 0); +disable_fgu: + regmap_update_bits(data->regmap, SC27XX_MODULE_EN0, SC27XX_FGU_EN, 0); + + return ret; +} + +static int sc27xx_fgu_parse_dt(struct sc27xx_fgu_data *data, + struct device_node *np) +{ + const __be32 *list; + int i, len, size, ret; + + ret = of_property_read_u32(np, "reg", &data->base); + if (ret) { + dev_err(data->dev, "failed to get fgu address\n"); + return ret; + } + + data->gpiod = devm_gpiod_get_optional(data->dev, "bat-detect", GPIOD_IN); + if (IS_ERR(data->gpiod)) { + dev_err(data->dev, "failed to get battery detection GPIO\n"); + return PTR_ERR(data->gpiod); + } + + data->channel = devm_iio_channel_get(data->dev, "bat-temp"); + if (IS_ERR(data->channel)) { + dev_err(data->dev, "failed to get IIO channel\n"); + return PTR_ERR(data->channel); + } + + /* Get the battery inner resistance */ + ret = of_property_read_u32(np, "sprd,inner-resist", &data->inner_resist); + if (ret) { + dev_err(data->dev, "failed to get battery inner resistance\n"); + return ret; + } + + /* Get battery ocv-capacity table */ + list = of_get_property(np, "sprd,ocv-cap-table", &size); + if (!list || !size) { + dev_err(data->dev, "failed to get ocv-capacity table\n"); + return -EINVAL; + } + + len = size / 8; + data->table_len = len; + data->cap_table = devm_kzalloc(data->dev, + sizeof(struct sc27xx_fgu_capacity_table) * len, + GFP_KERNEL); + if (!data->cap_table) + return -ENOMEM; + + for (i = 0; i < len; i++) { + data->cap_table[i].ocv = be32_to_cpu(*list++); + data->cap_table[i].capacity = be32_to_cpu(*list++); + } + + return 0; +} + +static int sc27xx_fgu_probe(struct platform_device *pdev) +{ + struct device_node *np = pdev->dev.of_node; + struct power_supply_config fgu_cfg = { }; + struct sc27xx_fgu_data *data; + int ret, irq; + + data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL); + if (!data) + return -ENOMEM; + + data->regmap = dev_get_regmap(pdev->dev.parent, NULL); + if (!data->regmap) { + dev_err(&pdev->dev, "failed to get regmap\n"); + return -ENODEV; + } + + mutex_init(&data->lock); + data->dev = &pdev->dev; + data->bat_present = true; + + ret = sc27xx_fgu_parse_dt(data, np); + if (ret) + return ret; + + fgu_cfg.drv_data = data; + fgu_cfg.of_node = np; + data->battery = devm_power_supply_register(&pdev->dev, &sc27xx_fgu_desc, + &fgu_cfg); + if (IS_ERR(data->battery)) { + dev_err(&pdev->dev, "failed to register power supply\n"); + return PTR_ERR(data->battery); + } + + ret = sc27xx_fgu_hw_init(data); + if (ret) { + dev_err(&pdev->dev, "failed to initialize fgu hardware\n"); + return ret; + } + + ret = devm_add_action(&pdev->dev, sc27xx_fgu_disable, data); + if (ret) { + sc27xx_fgu_disable(data); + dev_err(&pdev->dev, "failed to add fgu disable action\n"); + return ret; + } + + irq = gpiod_to_irq(data->gpiod); + if (irq < 0) { + dev_err(&pdev->dev, "failed to translate GPIO to IRQ\n"); + return irq; + } + + ret = devm_request_threaded_irq(&pdev->dev, irq, NULL, + sc27xx_fgu_bat_detection, + IRQF_ONESHOT | IRQF_TRIGGER_RISING | + IRQF_TRIGGER_FALLING, + pdev->name, data); + if (ret) { + dev_err(&pdev->dev, "failed to request IRQ\n"); + return ret; + } + + return 0; +} + +static const struct of_device_id sc27xx_fgu_of_match[] = { + { .compatible = "sprd,sc2731-fgu", }, + { } +}; + +static struct platform_driver sc27xx_fgu_driver = { + .probe = sc27xx_fgu_probe, + .driver = { + .name = "sc27xx-fgu", + .of_match_table = sc27xx_fgu_of_match, + } +}; + +module_platform_driver(sc27xx_fgu_driver); + +MODULE_DESCRIPTION("Spreadtrum SC27XX PMICs Fual Gauge Unit Driver"); +MODULE_LICENSE("GPL v2");
This patch adds the Spreadtrum SC27XX serial PMICs fuel gauge support, which is used to calculate the battery capacity. Original-by: Yuanjiang Yu <yuanjiang.yu@unisoc.com> Signed-off-by: Baolin Wang <baolin.wang@linaro.org> --- drivers/power/supply/Kconfig | 7 + drivers/power/supply/Makefile | 1 + drivers/power/supply/sc27xx_fuel_gauge.c | 705 ++++++++++++++++++++++++++++++ 3 files changed, 713 insertions(+) create mode 100644 drivers/power/supply/sc27xx_fuel_gauge.c -- 1.7.9.5